语法: lua_http10_buffering on|off
默认: lua_http10_buffering on
环境: http, server, location, location-if
对 HTTP 1.0（或更老）请求，启用或禁用自动应答缓冲区。这个缓冲机制主要用于应答头包含合适Content-Length长度的 HTTP 1.0 长连接。
如果 Lua 代码在发送应答头之前明确设置了应答头的Content-Length（调用 ngx.send_headers 或 隐式首次调用 ngx.say 或 ngx.print 其中任何一个），HTTP 1.0应答缓冲区都将被禁用，即使这个指令是打开的。
流式输出（例如，调用 ngx.flush）非常大的应答体，为了占用内存最小，该指令必须设置为off。
该指令默认值是on。
该指令是在v0.5.0rc19版本首次引入的。
English source:
syntax: lua_http10_buffering on|off
default: lua_http10_buffering on
context: http, server, location, location-if
Enables or disables automatic response buffering for HTTP 1.0 (or older) requests. This buffering mechanism is mainly used for HTTP 1.0 keep-alive which replies on a proper Content-Length response header.
If the Lua code explicitly sets a Content-Length response header before sending the headers (either explicitly via ngx.send_headers or implicitly via the first ngx.say or ngx.print call), then the HTTP 1.0 response buffering will be disabled even when this directive is turned on.
To output very large response data in a streaming fashion (via the ngx.flush call, for example), this directive MUST be turned off to minimize memory usage.
This directive is turned on by default.
This directive was first introduced in the v0.5.0rc19 release.